Pipe-cutter.



M. CRAMER.

PIPE CUTTER.

APPLICATION man OCT. 20. 1916.

Patented. Feb. 6, 1917.

. position.

MORRIS ORAMER, F CLEVELAND, OHIO.

PIPE-CUTTER.

To (ZZZ whom it may concern.

Be it known that I, MoRRIs CRAMER, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Pipe-Cutters, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to pipe cutters, and has for its general object the provision of a simple, efiicient pipe cutter which shall cut pipes by removing a portion of the metal in such a way as to avoid leaving burs at the inside or the outside of either of the adjacent severed ends.

In carrying out my invention I use a frame similar to the usual pipe cutter frame, provided with relatively adjustable separated rollers adapted to engage the exterior of various sizes of tubes and permit the cutter frame to revolve about the same. Be tween the paths of these rollers is carried a cutter adapted to engage and remove from the pipe a narrow strip of metal upon each revolution of the cutter frame, the cutter being urged into engagement with the pipe by any suitable means.

A pipe cutter constructed substantially as above, is shown, described and claimed in my prior application N 0. 122,621, filed September 28, 1916.

A more specific object of the present in vention is to provide a plurality of readily interchangeable cutters, each adapted to be brought into operative position, thereby allowing most convenient replacement of a dulled or broken cutter. To this end I have constructed a series of cutters integral. with a single disk, and so arranged as to be given a partial rotation to bring fresh cutters into operative position, and having conveniently operable means for locking the same with any of its cutter teeth in cutting Still another object is to so shape individual cutters on this disk that a por tion of a cutter adjacent the one in operative position may engage the pipe being severed, to prevent feeding the cutter into the metal too rapidly.

My invention is hereinafter more fully described in connection with the accompanying drawings. Other features of my invention are set out in the description and the essential characteristics are summarized in the claims.

Specification of Letters Patent.

Application filed October 20, 1916.

taken substantially on a Patented Feb. 6, 191?. Serial No. 126,782.

Referring to the drawings, Figure 1 is a side elevation of my pipe cutter; Fig. 2 is an edge elevation of the same; Fig. 3 is an axial section, showing the cutter, its locking and carrying mechanism, and the means for feeding the same into the pipe; Fig. 5! is a detail view of the cutter and its carrier rcmoverl; Fig. 5 is a transverse sectional plan plane indicated by the line 55 of Fig. 1.

Referring to the parts by numerals, the frame of my cutter comprises a substantially C-shaped member having an outwardly extending boss 12 provided with internal threads cooperating with a threaded adjusting rod 1-1, rigidly carrying at its outer end a fluted handle 15 secured to the rod 14L by threads, and a pin extending through the handle and rod, as indicated at 16. Art the lower end of this rod is rigidly mounted a head 1.7 rotatably engaging a sulr stantially cylindrical socket 18 in a vertically slieable rider 20. This rider carries two pairs of rollers 21 and 22, each pair being axially separated, as indicated in Fig. 2, while the rider itself engages laterally extending flanges 23 of the frame. The rider is shown as made in two parts and having grooves embracing these flanges when these two parts are secured together and in position by bolts Below the rider the frame is bifurcated and provided with suitable bearings for pairs of rollers 25 and mounted similarly to the rollers 21 and 22.

Clutter-s are shown ii'itcgral with a cutter disk 81 rotatably carried on a pin 32 extending through a lougitudiu ally movable carrier 35. This carrier has a deep slot transversely of its upper end, receiving the substantially parallel sides of the disk 31, and below the pin is a locking screw 34, closely fitting the space between adjacent teeth of the cutter disk. This screw 3% slidably engages a slot 36 in the casing, which is surrounded by a raised rib, engaged by the head 37 of this screw, which may be turned to remove and replace the screw as is necessary to present new cutter teeth to the pipe.

It will be seen that as the rollers 25 and 26 are axially separated and each has an individual bearing pin, the cutters 30 may be retated and vertically moved in the space between these rollers and the bearings, and the screw 34 may have a corresponding movement by reason of the slot 36 in the frame.

. able arbor extending through The carrier 35 is shown as cylindrical and slidably fitting av bore lO in a boss 42 at the opposite end of the frame from the boss Within this bore is a compression spring at adapted to exert sufficient pressure on this carrier to force the cutter into active engagement with the pipe and cause it to be fed therethrough as the frame is rotated. This spring 44: bears at its upper end against the carrier 35 and at its lower end the pressure is received by a cap threaded onto the boss 42 and shown as provided with a shoulder against which the spring rests. The cutter is prevented from rotating with relation to the frame by reason of finished shoulders 33 at each side of the carrier 35, the bore for this cutter being continued upwardly to provide the maximum amount of bearing for the carrier. The shoulders closely engage the parallel sides of the disk portion 31 of the cutter, thus holding it constantly in proper relation to the pipe, while permitting its rotation and longitudinal movement.

The cutter (shown in detail in Fig. l), is designed to embody the following advair tageous features. Each tooth is adapted to serve as a stop finger, limiting the inward feeding movement of the cutter tooth which is removing metal from the pipe. This operation is illustrated particularly in Fig. 3, where the tooth immediately to the right of the one removing metal is shown as extending into the peripheral groove in the pipe made by the cutting tooth, and, engaging the bottom of the groove, limits the feeding movement and prevents the cutter breaking through the last remaining portion of the metal too quickly. 7

It will be seen fromthe edge view in Fig. 5, that the cutter disks may be very conveniently turned from circular disks to form the cross-.sectional contour of the teeth. The cutter disks may then be mounted on a suitthe central opening, and the notches dividing the po rlpheral portion of the disks into teeth may be milled by a single mill of the proper shape, advanced progressively across a number of these cutters. The metal. may be removed between the teeth while cutting the same, by a tool adapted to form the bottom of the notch in a semi-circular curve. This saves labor, as the bottom portion of any notch is thus adapted to be closely engaged by thelocking pin 34, obviating the necessity other devices of providing a series of holes or for locking the cutter disk. 7

Accordingly, the cutter is not only capable of being readily manufactiu'ed, but one tooth serves the function of preventing too rapid feeding of the operating tooth, and is so shaped as to avoid endangering its own cutting edge. This feature of regulating the depth of the out has the additional value of prolonging the life of each individual cut- 61. The handle 1 is threaded into the tin ted member 15, the function of which is to provide a convenient means for turning the adjusting rod 14 to move the rollers 21 and 22 toward or away from the rollers 25 and 26, to engage or release a pipe. The handle 61 is shown as threaded into the cap 530 and these two handles provide suitable leverage for causing the rotation of the frame about the pipe.

The cap 50 is shown as provided with an axially threaded opening 62, which may be normally closed by a screw 63, to which access may be gained by removing thehandle 61. This set screw provides a removable closure for the opening 62, whereby oil may be placed in the chamber 40, which may be led to the cutter by a suitable passage 65. I have found that under certain conditions oil will feed itself along the carrier 35 and to the cutter, without the provision of any special passage for this purpose.

Having thus described my invention, what 1 claim is r V 1. In apipe cutter, the combination of a frame adapted to be revolved about a pipe. a cutter disk rotatably carried by the frame and having a plurality of outwardly extending individual cuttenteeth, each provided with a cutting point and a. depthlimiting heel, means for locking the cutter disk in various positions, and means for holding the pi pc in position for the point of one cutting tool to enter the stock of the pipe and the heel of the next tool to engage the stock of the pipe within the path 'ofthe tool which is cutting.

2. The combination with apipe cutter and simple to frame adapted to embrace and be revolved mei'nber having a plurality of outwardly projecting cutting teeth, means for locking said cutter in position to presentany one of said teeth to a pipe embracedby anembrae ingmeans... a i. 7

4. In a pipe cutter, the combination of a I r 120 the combination of a: r

frame adapted to revolve about a. pipe, a member rotatably carried by the frame and having a plurality of separated alined cutting teeth, means for locking the cutter in position to present any one of said teeth to the pipe, said teeth being so arranged that a tooth adjacent the cutting tooth may engage the pipe to prevent too rapid feeding of the cutting tooth.

5. In a device of the character described, the combination with a pipe-embracing means, a plurality of separated individual cutters, a member rigidly carrying each of said cutters and movable to present each cutter to the pipe, said cutters being so arran ed that when one of them is cutting a portion of an adjacent cutter remote from its cutting edge may bear against the metal operated upon just ahead of the tool which is cutting.

(S. The combination with a. pipe cutter frame adapted to be revolved about a pipe, a movable member carried thereby and having a plurality of separated alined cutting teeth, means for locking said member into position to present each of said teeth to the pipe, each of said cutting elements having a raised heel portion adapted to engage the metal being operated upon just ahead of the operating cutting element, and spring actuated means carrying said cutter member.

7. The combination with a pipe cutter frame adapted to be revolved about a pipe. a movable member carried thereby and hav-. ing' a plurality of separated alined cutting teeth, means for locking said member into position to present each of said teeth to the pipe, each of said cutting elements having a raised heel portion adapted to engage the metal being operated upon just ahead of the operating cutting element, a longitudinally movable carrier for the cutters, and a compression spring for urging the same toward the pipe.

8. The combination with a pipe cutter frame adapted to be revolved about a pipe, a cutter disk carried thereby and having a Copies of this patent may be obtained for plurality of outwardly extending individual cutter teeth, a carrier embracing said disk and permitting its rotation, means for urging the carrier and cutter toward the pipe, and a locking element extending into said member between adjacent teeth thereby loclc ing it in position to present one of its teeth to the pipe.

9. The combination with a pipe cutter :lrame adapted to be revolved about a pipe, a cutter disk carried thereby and having plurality of outwardly extending individual cutter teeth, a carrier embracing said disk and permitting its rotation, means for urging the carrier and cutter toward the pipe, and a screw extending into said carrier and closely engaging the space between said teeth.

10. In a pipe cutter, the combination with a frame adapted to be revolved about a pipe, a cutter member carried thereby and comprising a substantially flat disk having a series of outwardly extending cutting elements formed in its periphery, said elements being separated by notches of uniform shape, a carrier embracing said cutter, means revolubly attaching the cutter thereto, means for moving the carrier and cutter toward the pipe, a screw having a shank adapted to fit said notches and having threads engaging the carrier and extending outside the frame and having a head at the exterior of the frame, whereby it may be removed to permit turning the cutter.

11. The combination with a pipe cutter frame, a plurality of pairs of axially separated rollers carried by the frame and adapted to run in laterally separated paths about a pipe, a cutter having a plurality of individual cutting elements and movable to present any of said elements to the pipe, means for locking the cutter in position with any one of said elements active, and means for urging said cutter toward the pipe.

in testimony whereof, I hereunto allix my signature.

MORRIS CRAMER.

Washington, D. G. 

